But when asked if another collaboration is likely, Hetfield tells Chilean newspaper La Tercera (via Metal Injection): "No. But even just talking with her, being around her, her energy was very, very exciting. She has lots of ideas, and she likes to push the boundaries like we do. So it was a good fit."

Hetfield reflects: “The actual show, live on TV, I was very angry. All the rehearsals, everything was perfect. Up to there, everything was working.

“But the silver lining is that Lady Gaga and me were singing closer, and there was a little more collaboration. She's an amazing person – very talented.”

Metallica will head back out on the road from next month on the North American leg of their WorldWired tour in support of Hardwired... To Self-Destruct. They’ll then return to Europe in September, with shows planned into 2018.